<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<!-- 声明相关的布尔值，表示今天是否下雨、是否适合出游等。 -->
		<script type="text/javascript">
			let isOK = true;
			console.log(isOK);
			console.log(typeof isOK); // boolean
			let isFinish = false;
			console.log(isFinish);
			console.log(typeof isFinish); // boolean
		</script>
	</body>
</html>
